Question: How did Owain Glyndwr die in 1416?
Paraphrase: Owain Glyndwr died in 1416 of what cause?
SPARQL (Wikidata): SELECT ?value WHERE { wd:Q317279 p:P570 ?s . ?s ps:P570 ?x filter(contains(YEAR(?x),'1416')) . ?s pq:P1480 ?value}